<template>
	<transition	name="slide">
		<div class="user-center">
			<div class="back" @click="back">
				<i class="icon-back"></i>
			</div>
			<div class="switches-wrapper">
				<switches
					:currentIndex="currentIndex"
					:switches="switches"
					@switch="switchItem"
				>
				</switches>
			</div>
			<div class="play-btn" @click="random" v-show="noResult">
				<i class="icon-play"></i>
				<span class="text">随机播放全部</span>
			</div>
			<div ref="listWrapper" class="list-wrapper">
				<scroll
					v-if="currentIndex === 0"
					ref="favoriteList"
					:data="favoriteList"
					class="list-scroll"
				>
					<div class="list-inner">
						<song-list
							:songs="favoriteList"
							@select="selectSong"
						></song-list>
					</div>
				</scroll>
				<scroll
					ref="playHistory"
					v-if="currentIndex === 1"
					:data="playHistory"
					class="list-scroll"
				>
					<div class="list-inner">
						<song-list
							:songs="playHistory"
							@select="selectSong"
						></song-list>
					</div>
				</scroll>
			</div>
			<div class="no-result-wrapper" v-show="noResult">
				<no-result :title="noResultDesc"></no-result>
			</div>
		</div>
	</transition>
</template>

<script>
	import Switches from '@/base/switches/switches';
	import SongList from '@/base/song-list/song-list';
	import Scroll from '@/base/scroll/scroll';
	import NoResult from '@/base/no-result/no-result';
	import { playlistMixin } from '@/common/js/mixin';
	import { mapGetters, mapActions, mapMutations } from 'vuex';

	export default {
		name: 'UserCenter',
		mixins: [playlistMixin],
		data() {
			return {
				currentIndex: 0,
				switches: [{name: '喜欢听的'}, {name: '最近听的'}]
			}
		},
		computed: {
			noResult() {
				if (this.currentIndex) {
					return !this.playHistory.length;
				} else {
					return !this.favoriteList.length;
				}
			},
			noResultDesc() {
				if (this.currentIndex) {
					return '您还没有听过歌曲';
				} else {
					return '您还没有收藏歌曲';
				}
			},
			...mapGetters(['favoriteList', 'playHistory'])
		},
		methods: {
			handlePlaylist(playlist) {
				const bottom = playlist.length ? '60px' : 0;
				this.$refs.listWrapper.style.bottom = bottom;
				this.$refs.favoriteList && this.$refs.favoriteList.refresh();
				this.$refs.playHistory && this.$refs.playHistory.refresh();
			},
			switchItem(index) {
				this.currentIndex = index;
			},
			selectSong(song) {
				this.insertSong(song);
				setTimeout(() => {
					this.setCurrentSong(song);
				}, 100);
			},
			back() {
				this.$router.back();
			},
			random() {
				let list = this.currentIndex ? this.playHistory : this.favoriteList;
				if (!list.length) return;
				const len = list.length;
				const rnd = parseInt(Math.random() * len);
				this.setCurrentSong(list[rnd]);
				this.randomPlay({list});
			},
			...mapMutations({
				setCurrentSong: 'SET_CURRENT_SONG'
			}),
			...mapActions(['insertSong', 'randomPlay'])
		},
		components: {
			Switches,
			SongList,
			Scroll,
			NoResult
		}
	}
</script>

<style lang="stylus" scoped>
	@import '../../common/stylus/variable'

	.user-center
		position: fixed
		top: 0
		bottom: 0
		z-index: 100
		width: 100%
		background: $color-background
		&.slide-enter-active, &.slide-leave-active
			transition: all 0.3s
		&.slide-enter, &.slide-leave-to
			transform: translate3d(100%, 0, 0)
		.back
			position: absolute
			top: 0
			left: 6px
			z-index: 50
			.icon-back
				display: block
				padding: 10px
				font-size: $font-size-large-x
				color: $color-theme
		.switches-wrapper
			margin: 10px 0 30px 0
		.play-btn
			box-sizing border-box
			width: 135px
			padding: 7px 0
			margin: 0 auto
			text-align: center
			border: 1px solid $color-text-l
			color: $color-text-l
			border-radius: 100px
			font-size: 0
			.icon-play
				display: inline-block
				vertical-align: middle
				margin-right: 6px
				font-size: $font-size-medium-x
			.text
				display: inline-block
				vertical-align: middle
				font-size: $font-size-small
		.list-wrapper
			position: absolute
			top: 110px
			bottom: 0
			width: 100%
			.list-scroll
				height: 100%
				overflow: hidden
				.list-inner
					padding: 20px 30px
		.no-result-wrapper
			position: absolute
			width: 100%
			top: 50%
			transform: translateY(-50%)
</style>